package com.jerry.waimai.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.jerry.waimai.common.CustomException;
import com.jerry.waimai.dto.SetmealDto;

import com.jerry.waimai.entity.Setmeal;
import com.jerry.waimai.entity.SetmealDish;
import com.jerry.waimai.mapper.SetmealMapper;
import com.jerry.waimai.service.SetmealDishService;
import com.jerry.waimai.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;
    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     * @param setmealDto
     */
    @Transactional
    @Override
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        })).collect(Collectors.toList());
        //保存套餐和菜品的关联信息，操作setmeal_dish，执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 删除套餐，同时要删除套餐和菜品的关联数据
     * @param ids
     */
    @Transactional
    @Override
    public void removeWithDish(List<Long> ids) {
        //查询套餐状态是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper();
        queryWrapper.in(Setmeal::getId, ids);
        queryWrapper.eq(Setmeal::getStatus, 1);
        int count = this.count(queryWrapper);
        //如果不能删除，抛出一个业务异常
        if(count >0){
            throw new CustomException("套餐正在售卖中，不能删除");
        }
        //如果可以删除，先删除套餐表中的数据
        this.removeByIds(ids);

        LambdaQueryWrapper<SetmealDish> queryWrapper1 = new LambdaQueryWrapper<>();
        queryWrapper1.in(SetmealDish::getSetmealId, ids);
        //删除关系表中的数据
        setmealDishService.remove(queryWrapper1);
    }

    /**
     * 更新套餐的同时，更新菜品
     * @param setmealDto
     */
    @Transactional
    @Override
    public void updateWithDish(SetmealDto setmealDto) {
        //更新dish表的基本信息
        this.updateById(setmealDto);
        //清理当前菜品对应的口味数据
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper();
        queryWrapper.eq(SetmealDish::getSetmealId, setmealDto.getId());
        setmealDishService.remove(queryWrapper);
        //添加当前提交过来的口味数据
        List<SetmealDish> dishes = setmealDto.getSetmealDishes();
        dishes = dishes.stream().map(item -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
        setmealDishService.saveBatch(dishes);
    }

    @Override
    public SetmealDto getByIdWithDish(long id) {
        SetmealDto setmealDto = new SetmealDto();
        Setmeal setmeal = this.getById(id);
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, setmeal.getId());
        List<SetmealDish> list = setmealDishService.list(queryWrapper);
        BeanUtils.copyProperties(setmeal, setmealDto);
        setmealDto.setSetmealDishes(list);
        return setmealDto;
    }

}
